Can someone put you out of their house?

You have to give us more information. If you were not supposed to pay rent, then you are a guest and can be asked to leave and legally you should as you have no right to be there, no matter how long you have been there. The owners problem is how to accomplish that without using or threatening force. If you were suppose to pay rent, no matter how long you have been there, the owner has to give you a three and/or thirty day notice and when those expire can go to court to have you evicted.